A checklist for second-hand computers

Posted on August 23, 2010, 8:00 am

It is very important to check a used computer thoroughly before buying it because it can cause problems in the future. A hard drive will not show any outward signs, but may deteriorate. Similarly the needle can suddenly slip and may cause scratches on the disc, ultimately leading to loss of memory used computers can fail any time. If they are checked, errors that may occur can be known. Let us first consider the possible defects that can occur when buying a used computer. hard drive failure can occur due to heavy wear over time. The heads read and write to a disk drive are used to retrieve or recode the data stored on the hard drive using a disk platter rotates at high speed. Over a period of time without failure or malfunction of disk increases. bad sectors of hard disk can be found that if an area full analysis is done on the computer used. The scanning time depends on the capacity and size of the hard disk of the computer used. Many skip this procedure because of the long process of scanning the entire disk and end up buying a computer is used with a bad sector. Monitors must be checked for defects. The malfunction of a monitor is called a joint “dry” which means the monitor does not work after preheating. This can be done only if the monitor is made to work for at least 20-30 minutes after ignition of the computer. Next is to look for potential opportunities of the central processing unit freezes. Normally, all the CPUs of a fan and heat sink unit to maintain freshness. Over a period of time fans can not function properly due to the accumulation of dust and dirt causing an overheating CPU and even lead to termination of operation. Although buying a used computer fan must be checked and if no abnormal noise is heard, it is not good for the purchase. The computer used can have a greater opportunity to obtain crashed and froze because of the use of the operating system for many years. There may be a cache or RAM fault due to exposure to courses leading to loss of data. To increase the performance of the computer and to avoid crashing, the operating system on the computer can be reinstalled with a new operating system or another. While controlling the computers used for defects, it is good to disconnect if no network connection present before testing. In addition, it is advisable to check the discs such as CD or DVD by their opening and closing and also play something on readers to see how they work. Monitors used computers can be checked for resolution and brightness by trying different color options, settings and so on. To check the hard disk size CMOS setup can be lived and to check the CPU speed, cache memory and RAM on the pause button is pressed when it appears on the screen during the boot process. To check the boot process, the computer can be turned on and off several times and see how he reacts. Verification must be done to see if all the passwords are erased before buying a used computer.